# Studying for math test

Multiply; then use fundamental identities to simplify the expression below and determine which of the following is not equivalent.
(sin x + cos x) ^2

a. 1+2sinxcosx
b. sec^2x−tan^2x+2cosxsinx
c. sec x + 2 sin x/sec x
d. sin^2x+cos^2x
e. 1+2cos (pi/2 -x) cosx

1. take a look at the related questions below. In particular,

http://www.jiskha.com/display.cgi?id=1468255540

posted by Steve
2. ah ok, so would it be answer a?

posted by Lottie
3. Read the question carefully. It said

which of the following is not equivalent?

Actually, both c & d are not

posted by Steve

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